Advertisements
Advertisements
Question
Describe the energy changes which take place in a radio.
Advertisements
Solution
A radio converts electrical energy into sound energy. In a radio set, electrical energy causes the speaker’s diaphragm to vibrate and produce sound. So, the radio converts electrical energy into kinetic energy and finally into sound energy. This energy transformation can be written as,
Electrical energy → Kinetic energy → Sound energy
APPEARS IN
RELATED QUESTIONS
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
Define the term 'energy' of a body. What is the SI unit of energy.
What is the difference between potential energy and kinetic energy?
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
What is the meaning of the symbol kWh? What quantity does it represent?
A microphone converts :
In the case of negative work, the angle between the force and displacement is
